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| 硫酸盐气溶胶对长江中下游夏季降水年代际转型的影响 | |
| 引用本文： | 吴伟,李双林,杨军,姚锦烽.硫酸盐气溶胶对长江中下游夏季降水年代际转型的影响[J].成都信息工程学院学报,2011,26(5):470-479. |
| 作者姓名： | 吴伟 李双林 杨军 姚锦烽 |
| 作者单位： | 1. 南京信息工程大学大气物理学院,江苏南京210044;中国科学院大气物理研究所竺可祯-南森国际研究中心,北京100029;中国人民解放军94865部队气象台,浙江杭州310021 2. 中国科学院大气物理研究所竺可祯-南森国际研究中心,北京,100029 3. 南京信息工程大学大气物理学院,江苏南京,210044 |
| 基金项目： | 中国科学院重要方向性资助项目(KZCX2-YW-Q11-03) |
| 摘 要： | 为了研究人为硫酸盐气溶胶增长对1970年代末长江中下游夏季降水年代际转型的影响，使用全球气候模式（GFDL—AM2），对硫酸盐直接气候效应进行了模拟。结果表明，硫酸盐气溶胶增长引起的降水年代际变化与观测到的降水转型有很好的时空一致性；观测中包括副热带高压西伸南移、中国东部近地面异常北风等夏季风年代际减弱信号以及对应的垂直温度、上升运动分布等均能很好地被模式再现。机制上，硫酸盐气溶胶通过引起负辐射强迫，造成中国中东部的大部分地区地面到对流层中层降温，海陆热力对比减小，使东亚夏季风减弱，雨带容易在长江中下游停留，从而导致该区域降水增多。于是，硫酸盐气溶胶增多对长江中下游降水年代际转型有重要贡献。 |
| 关 键 词： | 气候学 气溶胶与气候变化 硫酸盐气溶胶 降水年代际转型 全球气候模式 |
Effect of Increasing Anthropogenic Sulfate Aerosols Concentration on the Decadal Shift of Summer Precipitation in the Middle and Lower Reaches of the Yangtze River |
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| WU Wei,LI Shuang-lin,YANG Jun,YAO Jin-feng.Effect of Increasing Anthropogenic Sulfate Aerosols Concentration on the Decadal Shift of Summer Precipitation in the Middle and Lower Reaches of the Yangtze River[J].Journal of Chengdu University of Information Technology,2011,26(5):470-479. | |
| Authors: | WU Wei LI Shuang-lin YANG Jun YAO Jin-feng |
| Institution: | 1.Institute of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,China;2.Institute of Atmospheric Physics,Chinese Academy of Science,Beijing 100029,China;3.The Observatory of Unit 94865,PLA,Hangzhou 310021,China) |
| Abstract: | To explore the impact of the increasing anthropogenic sulfate aerosol concentration on the decadal shift of summer precipitation in the middle and lower reaches of the Yangtze River valley since the late-1970s, a global climate model （GFDL-AM2） is employed to conduct ensemble sensitive experiments. The modeled results display that the spatial-temporal structure shift of summer rainfall bear a big similarity to the observed. In particular, the shift characteristics in several East Asian Summer Monsoon subsystems, including the southward and westward stretch of the western Pacific subtropical high and the anomalous northerly along the east coast of East China as well as those in the vertical distribution of air temperature and vertical velocity, can be captured. Mechanisticly, the increasing sul- fate aerosols causes intensified negative radiative forcing, results in cooling in much of east China from the surface to the middle troposphere. Subsequently, this weakens the land-sea thermal contrast and East Asian Summer Monsoon, and favors the rainband staying in the Yangtze River basin rather than moving northward to North China and North-east China in middle summer （July-August）. Thus, it is concluded that the increased anthropogenic sulfate aerosols have contributed substantially to the decadal shift of summer precipitation in the middle and lower reaches of the Yangtze River since the late-1970s. |
| Keywords: | climatology aerosols and climate change sulfate aerosols decadal shift of summer rainfall in East Asia global climate model（AM2） |
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